// 实现这个项目的构建任务
const { src ,dest,parallel,series,watch} = require('gulp')

const del = require('del')
const browser = require('browser-sync')
const loadPlugins = require('gulp-load-plugins')
const plugins = loadPlugins()
const data = {
  menus: [
    {
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [
        {
          name: 'Twitter',
          link: 'https://twitter.com/w_zce'
        },
        {
          name: 'About',
          link: 'https://weibo.com/zceme'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/zce'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}
const clean = () =>{
  return del(['dist','temp'])
}
const bs = browser.create()
const style = () =>{
  return src('src/assets/styles/*.scss',{base:'src'})
    .pipe(plugins.sass())
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}
const script = () =>{
  return src('src/assets/scripts/*.js',{base:'src'})
    .pipe(plugins.babel({presets:['@babel/preset-env']}))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}
const page = () =>{
  return src('src/*.html',{base:'src'})
    .pipe(plugins.swig(
      data
    ))
    .pipe(dest('temp'))
    .pipe(bs.reload({stream:true}))
}

const img = () =>{
  return src('src/assets/images/**',{base:'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}
const font = () =>{
  return src('src/assets/fonts/**',{base:'src'})
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}
const extra = () =>{
  return src('public/**',{base:'public'})
    .pipe(dest('dist'))
}
const serve=()=>{
  watch('src/assets/styles/*.scss',style)
  watch('src/assets/scripts/*.js',script)
  watch('src/*.html',page)
  watch(['src/assets/images/**','src/assets/scripts/*.js','public/**'],bs.reload)
  bs.init({
    server:{
      baseDir:['temp','src','public'],
      routes:{
        '/node_modules':'node_modules'
      }
    }
  })
}
const useref = ()=>{
  return src('temp/*.html',{base:'temp'})
    .pipe(plugins.useref({searchPath:['temp','.']}))
    .pipe(plugins.if(/\.js$/,plugins.uglify()))
    .pipe(plugins.if(/\.css$/,plugins.cleanCss()))
    .pipe(plugins.if(/\.html$/,plugins.htmlmin({
      collapseWhitespace:true,
      minifyCss:true,
      minifyJS:true
    })))
    .pipe(dest('dist'))
}
const compile = parallel(style,script,page)

const build = series(clean,parallel(series(compile,useref),extra,img,font))

const dev = series(compile,serve)
module.exports = {
  compile,
  build,
  clean,
  dev,
}